OOS overhead is non-associated overhead. Which of the following descriptions about OOS overhead is wrong?

• A.Use the 21st-23rd time slot in the optical supervisory channel (OSC) signal frame structure to transfer overhead
• B.OOS overhead is not enabled by default
• C.OOS overhead occupies 2Mbit/s bandwidth
• D.OOS overhead includes OTS, OMS/OCh overhead

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In ROADM, which of the following levels of OTN paths do not need to be manually configured, and can be obtained directly through path search? (Multiple choice)

• A.OCh
• B.OTS
• C.OSC
• D.OMS

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Which of the following overheads are ODUk-level overheads? (Multiple choice)

• A.TCM
• B.PM
• C.NJO
• D.APS/PCC

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OptiXtrans E9600/optiX OSN 9800 has a large cross-connection capacity and is mainly used in the metropolitan area/aggregation layer, while the OptiXtrans E6600/OptiX oSN 1800 has a small cross-connection capacity and is mainly used in the metropolitan area edge/access layer

• A.True
• B.False

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When the ACT indicator of the SDH board is off, it means that the board has a hardware failure and cannot be used.

• A.False
• B.True

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